fix(ff-effect): memory leak in Inngest handler

[fdarian]

Summary

• Removes extract() function call that was keeping references alive
• Replaces with direct Effect.scoped() to properly manage resource cleanup
• Fixes memory leak in Inngest createFunction handler

Test plan

• Verify Inngest functions work correctly with the updated handler
• Monitor memory usage in production to confirm leak is resolved
• Run existing tests to ensure no regressions